v. 用环锯在……上做手术，用环锯在头骨上钻孔（trephine 的现在分词）
1.This paper introduces a metallic fixation instrument designed to facilitate trephining o:f corneal grafts from the donor eye.
本文介绍了一种新的钻取角膜的固定器。本器械的优点是；
2.This paper introduces a metallic fixation instrument designed to facilitate trephining o:f corneal grafts from the donor eye.
本文介绍了一种新的钻取角膜的固定器。本器械的优点是；